198767-46-3 2-Phenyl-3-ethyl-2,3-dihydro-4H-1,3,2-benzoxazaphosphorin-4-one 2-sulfide 3-Ethyl-2-phenyl-2,3-dihydro-4H-1,3,2-benzoxazaphosphorin-4-one 2-sulfide 4H-1,3,2-Benzoxazaphosphorin-4-one, 2,3-dihydro-3-ethyl-2-phenyl-, 2-sulfide